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During primary treatment, all solids tha...

During primary treatment, all solids that settle forms __A__ and the supernaiani forms __B__.

A

A - Primary sludge, B - effluent

B

A- Primary sudge, B - secondary effluent

C

A - Activated sludge, B - clarified effluent

D

A - Activated sludge, B - effluent

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